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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::filesystem::path::</span>append, <span style="font-size:0.7em; line-height:130%">std::filesystem::path::</span>operator/=</h1>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../is_other.html" title="cpp/filesystem/is other"><span class="t-lines"><span>filesystem::is_other</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../is_regular_file.html" title="cpp/filesystem/is regular file"><span class="t-lines"><span>filesystem::is_regular_file</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../is_socket.html" title="cpp/filesystem/is socket"><span class="t-lines"><span>filesystem::is_socket</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="../is_symlink.html" title="cpp/filesystem/is symlink"><span class="t-lines"><span>filesystem::is_symlink</span></span></a></div></div></td></tr>
</table></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><a href="../path.html" title="cpp/filesystem/path"><tt>std::filesystem::path</tt></a><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5"> 常量</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="format.html" title="cpp/filesystem/path/format"><span class="t-lines"><span>path::native_format</span><span>path::generic_format</span><span>path::auto_format</span></span></a></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 成员函数</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="path.html" title="cpp/filesystem/path/path"><span class="t-lines"><span>path::path</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="~path.html" title="cpp/filesystem/path/~path"><span class="t-lines"><span>path::~path</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator%3D.html" title="cpp/filesystem/path/operator="><span class="t-lines"><span>path::operator=</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="assign.html" title="cpp/filesystem/path/assign"><span class="t-lines"><span>path::assign</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>path::append</span><span>path::operator /=</span></span></strong></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="concat.html" title="cpp/filesystem/path/concat"><span class="t-lines"><span>path::concat</span><span>path::operator +=</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="clear.html" title="cpp/filesystem/path/clear"><span class="t-lines"><span>path::clear</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="make_preferred.html" title="cpp/filesystem/path/make preferred"><span class="t-lines"><span>path::make_preferred</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="remove_filename.html" title="cpp/filesystem/path/remove filename"><span class="t-lines"><span>path::remove_filename</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="replace_filename.html" title="cpp/filesystem/path/replace filename"><span class="t-lines"><span>path::replace_filename</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="replace_extension.html" title="cpp/filesystem/path/replace extension"><span class="t-lines"><span>path::replace_extension</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="swap.html" title="cpp/filesystem/path/swap"><span class="t-lines"><span>path::swap</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="compare.html" title="cpp/filesystem/path/compare"><span class="t-lines"><span>path::compare</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="begin.html" title="cpp/filesystem/path/begin"><span class="t-lines"><span>path::begin</span><span>path::end</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="native.html" title="cpp/filesystem/path/native"><span class="t-lines"><span>path::c_str</span><span>path::native</span><span>path::operator string_type</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="string.html" title="cpp/filesystem/path/string"><span class="t-lines"><span>path::string</span><span>path::u8string</span><span>path::u16string</span><span>path::u32string</span><span>path::wstring</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="generic_string.html" title="cpp/filesystem/path/generic string"><span class="t-lines"><span>path::generic_string</span><span>path::generic_u8string</span><span>path::generic_u16string</span><span>path::generic_u32string</span><span>path::generic_wstring</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="lexically_normal.html" title="cpp/filesystem/path/lexically normal"><span class="t-lines"><span>path::lexically_normal</span><span>path::lexically_relative</span><span>path::lexically_proximate</span></span></a></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h2"><td colspan="5">路径分解</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="root_name.html" title="cpp/filesystem/path/root name"><span class="t-lines"><span>path::root_name</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="root_directory.html" title="cpp/filesystem/path/root directory"><span class="t-lines"><span>path::root_directory</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="root_path.html" title="cpp/filesystem/path/root path"><span class="t-lines"><span>path::root_path</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="relative_path.html" title="cpp/filesystem/path/relative path"><span class="t-lines"><span>path::relative_path</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="parent_path.html" title="cpp/filesystem/path/parent path"><span class="t-lines"><span>path::parent_path</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="filename.html" title="cpp/filesystem/path/filename"><span class="t-lines"><span>path::filename</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="stem.html" title="cpp/filesystem/path/stem"><span class="t-lines"><span>path::stem</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="extension.html" title="cpp/filesystem/path/extension"><span class="t-lines"><span>path::extension</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="empty.html" title="cpp/filesystem/path/empty"><span class="t-lines"><span>path::empty</span></span></a></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="has_path.html" title="cpp/filesystem/path/has path"><span class="t-lines"><span>path::has_root_path</span><span>path::has_root_name</span><span>path::has_root_directory</span><span>path::has_relative_path</span><span>path::has_parent_path</span><span>path::has_filename</span><span>path::has_stem</span><span>path::has_extension</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="is_absrel.html" title="cpp/filesystem/path/is absrel"><span class="t-lines"><span>path::is_absolute</span><span>path::is_relative</span></span></a></div></div></td></tr>
</table></div></td></tr>
<tr class="t-nv-h1"><td colspan="5">非成员函数</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="swap2.html" title="cpp/filesystem/path/swap2"><span class="t-lines"><span>swap(path)</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="hash_value.html" title="cpp/filesystem/path/hash value"><span class="t-lines"><span>hash_value</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator_cmp.html" title="cpp/filesystem/path/operator cmp"><span class="t-lines"><span>operator==</span><span>operator!=</span><span>operator&lt;</span><span>operator&lt;=</span><span>operator&gt;</span><span>operator&gt;=</span><span>operator&lt;=&gt;</span></span></a></div><div><span class="t-lines"><span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-until-cxx20">(C++20 前)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator_slash.html" title="cpp/filesystem/path/operator slash"><span class="t-lines"><span>operator/</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="operator_ltltgtgt.html" title="cpp/filesystem/path/operator ltltgtgt"><span class="t-lines"><span>operator&lt;&lt;</span><span>operator&gt;&gt;</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="u8path.html" title="cpp/filesystem/path/u8path"><span class="t-lines"><span>u8path</span></span></a></div></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dcl t-since-cxx17">
<td> <div><span class="mw-geshi cpp source-cpp">path<span class="sy3">&amp;</span> operator<span class="sy2">/</span><span class="sy1">=</span><span class="br0">(</span><span class="kw4">const</span> path<span class="sy3">&amp;</span> p<span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td> <span class="t-mark-rev t-since-cxx17">(C++17 起)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Source <span class="sy1">&gt;</span><br>
path<span class="sy3">&amp;</span> operator<span class="sy2">/</span><span class="sy1">=</span><span class="br0">(</span> <span class="kw4">const</span> Source<span class="sy3">&amp;</span> source <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-cxx17">(C++17 起)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> Source <span class="sy1">&gt;</span><br>
path<span class="sy3">&amp;</span> append<span class="br0">(</span> <span class="kw4">const</span> Source<span class="sy3">&amp;</span> source <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (3) </td>
<td> <span class="t-mark-rev t-since-cxx17">(C++17 起)</span> </td>
</tr>
<tr class="t-dcl t-since-cxx17">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span><span class="sy1">&lt;</span> <span class="kw1">class</span> InputIt <span class="sy1">&gt;</span><br>
path<span class="sy3">&amp;</span> append<span class="br0">(</span> InputIt first, InputIt last <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (4) </td>
<td> <span class="t-mark-rev t-since-cxx17">(C++17 起)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<div class="t-li1"><span class="t-li">1)</span> 若 <span class="t-c"><span class="mw-geshi cpp source-cpp">p.<span class="me1">is_absolute</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">||</span> <span class="br0">(</span>p.<span class="me1">has_root_name</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;&amp;</span> p.<span class="me1">root_name</span><span class="br0">(</span><span class="br0">)</span> <span class="sy3">!</span><span class="sy1">=</span> root_name<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> ，则以 p 替换当前路径，如同用 <span class="t-c"><span class="mw-geshi cpp source-cpp">operator<span class="sy1">=</span><span class="br0">(</span>p<span class="br0">)</span></span></span> 并终止。</div>
<div class="t-li1"><span class="t-li"></span> * 否则，若 <span class="t-c"><span class="mw-geshi cpp source-cpp">p.<span class="me1">has_root_directory</span><span class="br0">(</span><span class="br0">)</span></span></span> ，则移除 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的通用格式路径名的任何根目录及整个相对路径 </div>
<div class="t-li1"><span class="t-li"></span> * 否则，若 <span class="t-c"><span class="mw-geshi cpp source-cpp">has_filename<span class="br0">(</span><span class="br0">)</span> <span class="sy3">||</span> <span class="br0">(</span><span class="sy3">!</span>has_root_directory<span class="br0">(</span><span class="br0">)</span> <span class="sy3">&amp;&amp;</span> is_absolute<span class="br0">(</span><span class="br0">)</span><span class="br0">)</span></span></span> ，则附加 <code>path::preferred_separator</code> 到 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的通用格式</div>
<div class="t-li1"><span class="t-li"></span> * 用以上之一处理后，附加 <code>p</code> 的原生格式路径名，从其通用格式忽略任何 <span class="t-spar">root-name</span> ，到 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span> 的原生格式。</div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co1">// 其中 "//host" 是根名</span>
path<span class="br0">(</span><span class="st0">"//host"</span><span class="br0">)</span>  <span class="sy2">/</span> <span class="st0">"foo"</span> <span class="co1">// 结果是      "//host/foo" （附加分隔符）</span>
path<span class="br0">(</span><span class="st0">"//host/"</span><span class="br0">)</span> <span class="sy2">/</span> <span class="st0">"foo"</span> <span class="co1">// 结果亦为    "//host/foo" （附加，无分隔符）</span>
 
<span class="co1">// POSIX 上，</span>
path<span class="br0">(</span><span class="st0">"foo"</span><span class="br0">)</span> <span class="sy2">/</span> <span class="st0">""</span>      <span class="co1">// 结果是 "foo/" （附加）</span>
path<span class="br0">(</span><span class="st0">"foo"</span><span class="br0">)</span> <span class="sy2">/</span> <span class="st0">"/bar"</span><span class="sy4">;</span> <span class="co1">// 结果是 "/bar" （替换）</span>
 
<span class="co1">// Windows 上，</span>
path<span class="br0">(</span><span class="st0">"foo"</span><span class="br0">)</span> <span class="sy2">/</span> <span class="st0">"C:/bar"</span><span class="sy4">;</span>  <span class="co1">// 结果是 "C:/bar"    （替换）</span>
path<span class="br0">(</span><span class="st0">"foo"</span><span class="br0">)</span> <span class="sy2">/</span> <span class="st0">"C:"</span><span class="sy4">;</span>      <span class="co1">// 结果是 "C:"        （替换）</span>
path<span class="br0">(</span><span class="st0">"C:"</span><span class="br0">)</span> <span class="sy2">/</span> <span class="st0">""</span><span class="sy4">;</span>         <span class="co1">// 结果是 "C:"        （附加，不带分隔符）</span>
path<span class="br0">(</span><span class="st0">"C:foo"</span><span class="br0">)</span> <span class="sy2">/</span> <span class="st0">"/bar"</span><span class="sy4">;</span>  <span class="co1">// 生成   "C:/bar"    （移除相对路径后附加）</span>
path<span class="br0">(</span><span class="st0">"C:foo"</span><span class="br0">)</span> <span class="sy2">/</span> <span class="st0">"C:bar"</span><span class="sy4">;</span> <span class="co1">// 生成   "C:foo/bar" （附加，忽略 p 的根名）</span></pre></div></div>
<div class="t-li1"><span class="t-li">2,3)</span> 同 <span class="t-v">(1)</span> ，除了接受任何 <span class="t-lc"><a href="../../string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span> 、 <span class="t-lc"><a href="../../string/basic_string_view.html" title="cpp/string/basic string view">std::basic_string_view</a></span> ，空终止多字符字符串，或指向空终止多字符序列的输入迭代器。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> operator<span class="sy2">/</span><span class="sy1">=</span><span class="br0">(</span>path<span class="br0">(</span>source<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></span></span> 。</div>
<div class="t-li1"><span class="t-li">4)</span> 同 <span class="t-v">(1)</span> ，但接受任何指代多字符字符串的迭代器对。等价于 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw1">return</span> operator<span class="sy2">/</span><span class="sy1">=</span><span class="br0">(</span>path<span class="br0">(</span>first, last<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span></span></span></div>
<p><span class="t-v">(2)</span> 与 <span class="t-v">(3)</span> 仅若 <code>Source</code> 与 <code>path</code> 不是同一类型，而且：
</p>
<ul><li> <code>Source</code> 是 <span class="t-lc"><a href="../../string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span> 或 <span class="t-lc"><a href="../../string/basic_string_view.html" title="cpp/string/basic string view">std::basic_string_view</a></span> 的特化，或
</li><li> <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../iterator/iterator_traits.html"><span class="kw651">std::<span class="me2">iterator_traits</span></span></a><span class="sy1">&lt;</span><a href="../../types/decay.html"><span class="kw629">std::<span class="me2">decay_t</span></span></a><span class="sy1">&lt;</span>Source</span><span class="mw-geshi cpp source-cpp"><span class="sy1">&gt;&gt;</span><span class="sy4">::</span><span class="me2">value_type</span></span></span> 合法并代表可能有 const 限定的编码字符类型（ <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 、 <span class="t-rev-inl t-since-cxx20"><span><span class="t-c"><span class="mw-geshi cpp source-cpp">char8_t</span></span> 、 </span> <span><span class="t-mark-rev t-since-cxx20">(C++20 起)</span></span></span><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char16_t</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char32_t</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">wchar_t</span></span></span> ）
</li></ul>
<p>才参与重载决议
</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  p
</td>
<td> -
</td>
<td>  要添加的路径
</td></tr>
<tr class="t-par">
<td>  source
</td>
<td> -
</td>
<td>  <span class="t-lc"><a href="../../string/basic_string.html" title="cpp/string/basic string">std::basic_string</a></span> 、 <span class="t-lc"><a href="../../string/basic_string_view.html" title="cpp/string/basic string view">std::basic_string_view</a></span> 、空终止多字节/宽字符串、或指向空终止多字符序列的输入迭代器，它表示路径名（以可移植或原生格式）
</td></tr>
<tr class="t-par">
<td>  first, last
</td>
<td> -
</td>
<td>  一对指定表示路径名的多字符序列的<a href="../../named_req/InputIterator.html" title="cpp/named req/InputIterator"><i>遗留输入迭代器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyInputIterator)</span> </a>
</td></tr>
<tr class="t-par-hitem">
<td colspan="3"> 类型要求
</td></tr>
<tr class="t-par-req">
<td colspan="3"> -<div class="spacer"></div><code>InputIt</code> 必须满足<a href="../../named_req/InputIterator.html" title="cpp/named req/InputIterator"><i>遗留输入迭代器</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(LegacyInputIterator)</span> </a> 的要求。
</td></tr>
<tr class="t-par-req">
<td colspan="3"> -<div class="spacer"></div><code>InputIt</code> 的 value_type 必须是编码字符（ <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">wchar_t</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char16_t</span></span></span> 及 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">char32_t</span></span></span> ）类型之一
</td></tr></table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
<p><span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="sy2">*</span>this</span></span>
</p>
<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
<p>若内存分配失败则可能抛出 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../../memory/new/bad_alloc.html"><span class="kw693">std::<span class="me2">bad_alloc</span></span></a></span></span> 。
</p>
<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
<p>这些函数等效地生成以 <code>*this</code> 为起始目录的环境中，参数路径 <code>p</code> 的含义估计。
</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;filesystem&gt;</span>
<span class="kw1">namespace</span> fs <span class="sy1">=</span> std<span class="sy4">::</span><span class="me2">filesystem</span><span class="sy4">;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
    fs<span class="sy4">::</span><span class="me2">path</span> p1 <span class="sy1">=</span> <span class="st0">"C:"</span><span class="sy4">;</span>
    p1 <span class="sy2">/</span><span class="sy1">=</span> <span class="st0">"Users"</span><span class="sy4">;</span> <span class="co1">// 不插入分隔符</span>
    <a href="../../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"<span class="es1">\"</span>C:<span class="es1">\"</span> / <span class="es1">\"</span>Users<span class="es1">\"</span> == "</span> <span class="sy1">&lt;&lt;</span> p1 <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
    p1 <span class="sy2">/</span><span class="sy1">=</span> <span class="st0">"batman"</span><span class="sy4">;</span> <span class="co1">// 插入 fs::path::preferred_separator ，在 Windows 上为 '\'</span>
    <a href="../../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"<span class="es1">\"</span>C:<span class="es1">\"</span> / <span class="es1">\"</span>Users<span class="es1">\"</span> / <span class="es1">\"</span>batman<span class="es1">\"</span> == "</span> <span class="sy1">&lt;&lt;</span> p1 <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>可能的输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">"C:" / "Users" == "C:Users"
"C:" / "Users" / "batman" == "C:Users\batman"</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E7.BC.BA.E9.99.B7.E6.8A.A5.E5.91.8A">缺陷报告</span></h3>
<p>下列更改行为的缺陷报告追溯地应用于以前出版的 C++ 标准。
</p>
<table class="dsctable" style="font-size:0.8em">
<tr>
<th> DR
</th>
<th> 应用于
</th>
<th> 出版时的行为
</th>
<th> 正确行为
</th></tr>
<tr>
<td> <a rel="nofollow" class="external text" href="https://cplusplus.github.io/LWG/issue3244">LWG 3244</a>
</td>
<td> C++17
</td>
<td> 缺失 <code>Source</code> 不能为 <code>path</code> 的制约
</td>
<td> 已添加
</td></tr></table>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="concat.html" title="cpp/filesystem/path/concat"> <span class="t-lines"><span>concat</span><span>operator+=</span></span></a></div></div>
</td>
<td>  连接二个路径而不加入目录分隔符 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="operator_slash.html" title="cpp/filesystem/path/operator slash"> <span class="t-lines"><span>operator/</span></span></a></div></div>
</td>
<td>  用目录分隔符连接二个路径 <br> <span class="t-mark">(函数)</span> </td></tr>
</table>

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